/**
 *  \file   comm.c
 *  \author Dang Huu Toan
 *  \date   08/05/14
 *  \brief  this file provide all function related to serial communication
 */
 #include "comm.h"
/**
 *  \brief USART1 Configure
 *  
 *  \return None
 *  
 *  \details Details
 */ 
void USART_Configuration(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
	/* Enable UART clock, if using USART2 or USART3 ... we must use RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); 
	
	/* Configure PA9 for USART Tx as alternate function push-pull */
	GPIO_InitStructure.GPIO_Pin = USART_Tx_Pin;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(USART_Port, &GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Pin = USART_Rx_Pin;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(USART_Port, &GPIO_InitStructure);
	
	USART_InitStructure.USART_BaudRate = 9600;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;	
 
	/* USART configuration */
	USART_Init(USART1, &USART_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	
	NVIC_Init(&NVIC_InitStructure);

	USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
	/* Enable USART */
	USART_Cmd(USART1, ENABLE);	
}
/**
 *  \brief sendchar retarget function
 *  
 *  \param [in] ch input character
 *  \return input character
 *  
 *  \details Details
 */
int sendchar(int ch)
{
  
		/* Transmit the character using USART1 */
			USART_SendData(USART1, (u8) ch);
  /* Wait until transmit finishes */
  while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
		{
			
		}
  return ch;
}  
/**
 *  \brief getkey retarget function
 *  
 *  \return character received
 *  
 *  \details Details
 */
int  getkey(void)
{
		u8 ch;
	
	 while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
		ch = USART_ReceiveData(USART1);
	 return ch;
		
}
